7-88 Routine maintenance
Chromatogram with peak areas displayed
To calculate the EI sensitivity
Calculate the EI sensitivity using the following equation:
Where
S is the EI sensitivity in coulombs/µg.
A is the average area of the peaks in bit-minutes, as determined in “To
process the data” on page 7-87; multiply this value by 60 to convert from
bit-minutes to bit-seconds).
1.07 × 10
9
is the maximum response of the analog-to-digital converter in
the EPC.
1.00 × 10
-6
is the ion beam current, in amps, that would produce the
maximum response.
G is the gain, as determined in “To measure the detector gain” on
page 7-84.
The EI sensitivity must be at least 5 × 10
-7
coulombs/µg. If the calculated
value is less than this value, contact Waters for advice.
See “Waters contact information” on page i-iv.
S
60A
1.07
9
×10
----------------------
1.00
6–
×10
G
-------------------------
×=
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